1. is the charge, in coulombs, which passes a point in a circuit in 1
minute when a current of 3 A is flowing?A
2 B 3
C 12
D 18E 180

2.is
the potential difference, in volts, required to pass a current of 3 A through
a resistor of 6 ohms?A 2 B
3
C 12
D 18E 180

Choose the best phrase from the list A to E below to
complete each of the sentences in the questions.

3 If a resistor is added in parallel with one of equal resistance, the
resistance of the combination ___________A increases by a small fraction B decreases by a small fractionC remains the sameD is doubledE is halved

4If a resistor is added in parallel with one of much smaller resistance,
the resistance of the combination ___________A increases by a small fraction B decreases by a small fractionC remains the sameD is doubledE is halved

5 If a resistor is added in series with one of equal resistance, the
resistance of the combinationA increases by a small fraction B decreases by a small fractionC remains the sameD is doubledE is halved

Each of the following questions or incomplete statements is followed by
five suggested answers labelled. Select the best answer in each case.

Four lamps each with a resistance of 6 ohms are connected in parallel
to a12 V battery which has no
internal resistance.

6 The current
flowing through the battery is
A 8A. B
6 A.
C
4A. D
2A. E
zero.

9 What is the charge which passes a point in a conductor when a current
of 10 mA flows for 50 s?A 0.2 CB 0.5 CC 5.0 CD 50 C E 500 C

10 The e.m.f of a battery is measured in the same units asA force.B potential difference. C energy.D power.
E charge.

11 A 6 V battery is made up of four 1.5 V cells, each with an internal
resistance of 0.2 ohms connected in series. The greatest current that could
possibly be obtained from such a battery isA
0.3 A.B 0.75 A. C 3.0 A.D 7.5 A.
E 30 A.

12On
which one of the following does the electrical resistance of a wire not depend?A the
density of the material of the wireB the resistivity of the material of the wireC the length of the wireD the temperature of the wireE the diameter of the wire

13Which
of the following changes would increase electrical resistance?A using a
shorter wireB using a thinner wireC using a
thicker wireDusing wire of lower resistivityEdecreasing the temperature of the wire

14A
pupil makes a resistor from a length of wire. She then makes a second resistor
using wireof the same material but of
half the diameter and twice the length. The ratio of the value of thesecond resistor to that of the first isA 1: 8B 1/2.C 1.D 2.E 8.

15 Figure 24.1 shows a circuit containing a cell and three similar lamps.

Which of the following statements about the brightness of the lamps is
correct?A L1 is brighter than
L2 which is brighter than L3.BL1 is brighter than L2 which has the same brightness as L3CL1 and L2 have the same brightness, but L3 is less bright.D L3 is brighter than L2 which is brighter than L1.EL3 is brighter than L2 which has the same brightness as L1.

Two
coils of wire of resistance 2 ohms and 4 ohms are connected in parallel with
each other, and a 6 volt battery is connected to this combination.

21 What current flows through the
headlamp?
A 2A
B 288A
C
4 A
D 0.5A
E
1A

22 What is the resistance of the element of an
electric fire, when it is in use, if it is rated at 2500 W
& 250 V?A 0.04 ohms
B 0.1 ohms.
C 10 ohmsD 25 ohms
E 250 ohms.

23 Which
of the following quantities do householders pay for when paying the
electricity bill?A currentB voltageC powerD energy
E resistance

Multiple
completion questions

For each of the questions, one or more than one of the
responses (i), (ii), (iii) (or 1, 2, 3) is/are correct. Select the one letter
A, B, C, D, E. which represents the correct responses.

24Which
of the following components has/have the same resistance to electric currents
flowing through them in either direction?1 a length of wire2 a
variable resistor3 a
diodeA 1 aloneB 3 aloneC l and 2D 2 and 3 E 1,2 and 3

26 Which of the following statements are true of a voltmeter?1 It has a low resistance.2 It is placed in parallel with a
piece of apparatus in a circuit.3 It may have its range increased
by the addition of a resistor in series with it.A 1, 2 and 3B 1 and 2C 2 and 3D 1 only E
3 only

27 A
circuit is connected up as shown.The
cell has negligible internal resistance.

When the value of the resistor P is reduced which of the following
statements is/are true?(i) The reading of ammeter A l increases.(ii) The reading of ammeter A2
decreases.(iii) The reading of ammeter A3
increases.A (i), (ii) and (iii)B (i) and (ii)C (i) and (iii)D (iii) only
E some other response

28 The
quantity of heat generated in a conductor when a current flows through it is
directly proportional to the(i) resistance of the conductor.(ii) current carried by the
conductor.(iii) time for which the current
flows.A(i), (ii) and (iii)B(i) and (ii)C
(i) and (iii)D (iii) only
E some other response

29 An
electric lamp is labeled 6 V 0.5 A. When it is operating correctly(i) the power of the lamp is 12 watts.(ii) the resistance of the lamp is
3 ohms.(iii) the energy it consumes in 5
seconds is 15 joules.A (i), (ii) and (iii)B (i) and (ii)C (i) and (iii)D (iii) only E some other response

30 A
2 kW electrical heater is used continuously. The heater:1 produces 2000 joules of energy every second.2 uses 20 kilowatt-hours of
electrical energy in 10 hours.3 passes a current of 8 A when
used on 250 V mains.A 1 aloneB 3 aloneC 1 and 2D 2 and 3E 1,2 and 3